Axial fan
CA 2024100 C · Owner: Tcf Industries, Inc. · Inventors: Kennedy, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An axial fan construction wherein individual blade assemblies (13) are secured within apertures (18) in the fan hub (12). Fasteners (25) extend between a retaining member (23) and a blade base (15) with each, blade base including a shoulder (27) overlying a bearing surface on the hub (19) and with resilient members (22) positioned between the blade base shoulders (27) and hub bearing surfaces (19). A spacer (21) maintains the blade base shoulders and retaining members a preselected distance apart to allow prestressing of the fasteners (25) while limiting the compressive force applied to the resilient member (22). The blade base shoulders (27) and hub bearing surfaces (19) are configured to …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 25, 1990 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.